Electric incandescent lamp.



F. DICKENSGHIED.

ELECTRIC INGANDESUENT LA MP.

APPLIOATION FILED JULY 15, 1912.

1, 1 1 8,402. Patented Nov. 34, 1914.

TED OFFlG lii.

FRIEDRICH DICKENSCHIED. OF BERLIN, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRIC INCANDESCENT LAMP.

Specification of Letters Patent.

Patented Nov. 24, 1914.

To all whom it may concern:

Be it known that I, Fmuoaron DICKEN- sounm, subject. of the German Emperor, and residing at Berlin, Germany, have invented certain new and useful Improvements in Electric Incandescent Lamps, of which the following is a. specification.

In the manufacture of metal filament lamps it has usually, up to the present. been the rule to arrange the long filament in the lamp in such a manner that the lighting surface was approximately distributed over a circular cylinder. The disadvantage of this arrangement is that the distribution oi light from the lamp in ditt'erent directions is unequal and only approximately uniform perpendicularly to the axis. The ditlcrent suggestions made up to the present to do away with this drawback have not attained practical in'iportance as the requirements With which such supports must comply in manufacturing lamps on a large scale has not been taken suliiciently into consideration.

One of the objects of the present invention is to secure as far as possible a uniform distribution of light in all directions by using a support of simple construction and arranged in such a manner that the filament can be readily attached to the support.

The nature of my invention and further advantages will best be understood by reference to the accompanying drawing showing one embodiment thereof in which--- Figure 1 is a view in perspective of the support with a filament wound thereon; Fig. 2 a plan view; and Fig. 3 is a view in perspective taken at a right angle to Fig. 1.

Three groups of supports or holding devices are provided for the filament; the group a, a, (1. at the apex of the central stem S an arranged in the form of radii of a semi-circle and are all located in a plane passing through the axis; the second group 150 ,0 ,the outer mcmlmrs 1,, o oi which serve as connections to the leads 1/, (l are secured at the base of the stem in the saint plane as the first group and are also arranged in the form ol' radii of a Stlltld'll't'lt; the third group 0. o, o" arc sccured at or near the central portion of the stem. are arranged in the form oi radii ot a circle. and are all located in a plane perpendicular to the axis of l'licslclu. 'lbc two outer bolders of the lirst group and the two outer holders of the second map are also in planes perpendicular to t m axis of the stem.

The filament is wound in one continuous length over the different supports in such a manner that there is a support of the third group between any two points of support of the first and second groups. Commencing at holder I) the filament passes for example to support 0 of group three, thence to support a of the first group, thence to support 0, thence to b, to and so on untll the holder b is finally reached. For attaching the filaments to the supports any of the well-l nowu devices may be used; all of the supports may be provided with eyes as indicated on the drawing or books may be used instead.

By arranging the first and second groups in the form of radii of semi-circles the filament. is spread out. over the greatest possible area for the length of support used. the distance between iuljacent portions of the iilament is large and at the same time a much more uniform distrilmtion of light in all directions is scrurcd than is obtained by the usual methods of mounting filaments. The two holders to which the leads (Z, (l are attached are also as far apart as possible and danger of arcing between them is reduced to a minimum.

What I claim is:

1. In an electric incandescent lamp, the combination with a central stem, of a group of filament holders arranged in the form of radii of a semi-circle at the top of the ecu tral stem in the same plane as its axis of a group of filament; holders in the same plane also arranged in the form of radii of a semi-circle at the foot of the central stem, of a third group of holders arranged in the Form oi radii of a circle between the first two groups. and of a filament between the two outer holders of the second group which is wound on the frame in such a manner that there is alwavs between one support of the first group of holders and another in the second group a support in the middle group. I

in an electric illt't\lltlt. t'tllt lamp, the combination with a central stem. of a group of tihuucnt holders arranged in the form of radii of a semicircle at the top of the central stciu in the same plauc as its axis, of a ioup ol' lilnuicut holders in the same. plane al o arranged in the form of radii of a semi circle at the foot of the central stem, of a third group of holders arranged in the form of radii of a circle between the first two groups in a plane perpendicular to the axis of the central stem, the two outer holders of the second group being in a plane perpendicular to the axis of the central stem and serving as connections for the current leads, and of a filament between the two outer holders of the second group which is Wound on the frame in such a manner that there is always between one support of the first group of holders and another in the second group a support in the middle group.

lln testimony whereof I eflix my signa- 1.5

ture in presence of two witnesses.

FRIEDRICH DICKENSOHIED. Witnesses:

W'OLDEMAR HAUPT, HENRY HASPER. 

